Apparatus for cutting screw-threads on pipes, &amp;c.



PATBNTED AUG. 7, 1906.

F. D- CABLE. ING SCREW TH APPARATUS FOR GUTT READS ON PIPES, 6m

APPLICATION FILED SEPT.11. 1905.

2 SHEETS-SHEET 1.

'4 a vs' PATENTED AUG. 7, 1906.

F. D. CABLE.

TING SCREW THREADS-0N PIPES, 6w.

APPARATUS FOR OUT APPLICATION FILED SEPT. 11. 1905.

2 SHEETS-SHEET 2.

y, ZZZ?Z257 5.;

Egg

' Screw-Threads on Pipes, &c.;

nres indicate the same parts.

UNITED STATES PATENT OFFIGE.

FRANK DAVID CABLE, OF TOLEDO, OHIO, ASSIGNOR TO ETNA MACHINE COMPANY, OF TOLEDO, OHIO, ACOPARTNERSHIP.

APPARATUS FOR CUTTING SCREW-THREADS O N PIPES, 800

1'0 aZZ whom it may concern..-

Be it known that I, FRANK DA-vn) CABLE, a citizen of the United States, residing at T0- ledo, in the county of Lucas and State of Ohio, have invented certain new and useful Improvements in Apparatus for Cutting and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, and to the letters'of reference marked thereon.

This invention relates to apparatus or means for cutting screw-threads onmetallic pipe orfother cylindrical objects, and more particularly to that class 'of apparatus designed to be manipulated manually to screw-- thread work which iss'uitably held or supported in a separate vise or other holding appliance. I The invention has for its object to provide a highly-efficient device capable of cutting accurate taper threads and which may be used with equal facility for cutting threads on work of several different diameters A further object of the invention isto provide an apparatus which will perform its functions with the expenditure of little power by the operator and which shall be capable of easy and quick manipulation or adjustment.

The invention consists in certain novel details of construction and combinations and arrangements of parts, all as will be nowdescribed, and pointed outv particularlyin the appiended claims. i eferring to the accom anying drawings, Figure 1 is a plan view looiing atthe face of the apparatus. Fig. 2 is a section longitudinally of the die-head, said section being taken on the line 2 2 of Fig. 1. Fig. 3 is a side elevation looking in the direction of the arrow 3 in Fig. 1', but with a portion broken away to show a section on line X of Fig. 1. Fig. 4 is an elevation, one half in section, on the-line. 4 4ofFig.'l.

Like letters of reference in the several fig- The Working :parts. of the mounted in or carried by a casing or frame A, having radial sockets A at opposite sides in which the ends of handles A may be inserted for turning the apparatus in cutting the thread or in backing the threading dies or Specification of Letters Patent. Application filed ".eptember 11,1905. Serial Ne. 277.979-

apparatus arev Patented Aug. *7, i906.

chasers out of the cut thread. The sockets A are preferably made adjustable and adapted to be clamped on the ends of the handles by set-screws or bolts A so as to form a convenient means for applying or removing. the handles to facilitate storage or 'transporta tion. The cylindrical casing or frame A at its rear end is connected with a tubular guide .0, preferably by a groove-and-roller connection whereby the guide and easing may be rotated with relation to each other .without permitting relative longitudinal movement. As shown in Fig. A, the groove 0 is ada'pteo to receive the inner ends of oppositely-arranged screws 0, having antifriction-rollers c mountfirm support against longitudinal movement of the parts. with relation to each other, but

at the same time will erm'it said parts to re volve freely with relation to each other. The guide C is provided with means whereby'it ay .or articleto be threaded, such means preferably consisting of an equally-spaced series of guide, sothat their inner ends will contact with the work and constitute either a bearing for positioning the device upon the work. or a means for connecting-the work and guide rigidly together'during the formation of taper threads, as will bepresently described.

be detachably connected with the work .ed thereon, said rollers being of such size as to approximately fill the grooves and afford a thumb-screws D, passing radially into the Guided'within the cylindrical casing A is a die-head B, said head being formed to fit the chamber between the -ex ternally-threaded extension C of the guide and the interior of The diesor chasers F are mounted in the die-' so as to be capable of a radial move head B, ment therein. Thus an the preferred construction said chasers'are substantially rectangular incross-secti'on and Work radially in slots or openings extending through the diehead B, their inner ends, however, being preferably supported by-abutments d, theportion of the die-head around said abutments withinternal threads adapt their outer ends the sald dies or chasers proand dies or ehasers being cut away to facilitate the escape of chips or droppings. At

- ject into guides or ways formed in the cylinjection of the dies or chasers' toward the cenfirmly in place by set-screws e'.

, stitute the s sembled inposition, so as to give accurate ter of the die-head. Inasmuch as the appa-' ratus is designedprimarily for cutting taperingthreads, the said guides or ways are formed with inclined supporting-surfaces for the outer ends of the said dies or chasers, and the inclination of such. supporting-surfaces determines the angle of the taper cut by the dies.

As illustrated in the drawings, the cylindrical casing or frame is provided with sockets E, arrangedparallel with each other and with the axis of the die-head, and in the sockets E cylinders E are'rnounted'and held ders are channeled on their inner sides to conguid es for'the outer ends of the dies or chasers. By this arrangement the parts may be accuratelyfmachined and asand certain results in operation. The cylinders E may be made of hard metal well calpossible to mix the dies or chasers so culated to withstand wear and stress, while the frame or casing may be made of cast-iron or other relatively cheap or light metal.

Each. die or. chaser is preferably provided on the outer side of the die-head .with a pin, such as G, which'will limit its inward movement, and in order to permit of the removal and substitution of dies or chasers of different length for operating on work of different diameters the die-head Bis capable of an'out- Ward movement sufficient to bring the dies or chasers above the face of the cylinder or frame, after which the dies or chasers may be drawn radially out oftheir sockets and others substituted. In this preferred construction the pins G are adapted to enter recesses in the die-head B, as shown in Fig. 1, and the pins and recesses are referably so disposed that they will enter on v when the pro er die is in the socket. Thus it is mechanica ly imcut imperfect threads. To relieve the dies from turning strain during the cutting of screw-threads, the die-head and external cylinder or frame are connected together so as to resist relative .movement around the axis of the die-head and at the same time permit of free relative longitudinal movement. "a convenient construcbe formed with'a keyway or groove o,-into which the end of a key I or set=screw N may project, as shown in Fig.

3, and "this set-screw may conveniently be arranged with its head in one of the sockets A, soils to be entirely concealed from view.

1 An adjustablestop is provided for limiting socket having a set-screw S Said cylinhead reaches the desired'outward position of adjustment. Topermit of a movement of the die-head outward sufficiently far for they removal of the dies or chasers, the stop-screw S maybe turned into position so as to permit the die-head to pass thev same, although in the ordinary working of the device it is designedthat the stop-screw shall be so adjusted "as to arrest the movement of the die-head 'at the proper point for determining the diame ter of t e entering end or smaller portion of the screw-thread to be formed. The socket for the stop-screw S." is preferably a clampfor drawing its sides-together to hold the screw very firmly in its adjusted position. 1

In some instances it is desirable to provide supplemental ameters, and, as shown, internal sleevesl may be mounted in the guide C and held by the set-screws D the screws, however, passing through the sleeves, so as to engage the work when it is desiredto connect the work and guide.

It will be noted that the supportingrguides for: the dies or chasers areremovable',v and consequently supporting-guides having different degrees of taper may be inserted or supporting-guides having slots of different depth may dies or chasers to a greater or less extent and permit chasers of standard length to be used for cutting threads on work of different diameters.

To thread pipe or other object, it is passed into the guide and positioned by the-setscrews. This should be done after the die head has been backed off or moved to its outward limit, as determined by. the stop-screw. The work is held in any suitable'vise or holder and rotation imparted to the casing and-die head, so as to feed the latter in along the leadscrew on the guide, thereby bringing the dies or chasers into engagement with the work to form the thread. As the die-head and Chasers move longitudinally of the work in forming the thread, the chasers move radially outward in accord with the inclined surfaces of the guiding-supports. Should it be desired to form a thread without taper, the guide is disconnected from be inserted, so as to project the the work after the chasers have been started, thereby permitting the apparatus to revolve as a unity and the chasersto feed themselves as an ordinary threadin die. Obviously by properly adjustin "t e die-head in the casing straight threa s may be out either deep-or shallow, as desired.

Having thus-described my invention, what the die-head and easing; substantially as de- I claim as new, and desire to secure by Let-- ters Patent, isi 1. In a screW-thread-dutting apparatus, the combination with the tubular work-guide having exterior screw-threads and a die-head having internal screw-threads meshing with those on the, uide, of radially-movable chasers mounted inthe die-head, a casing rotatably mounted on the, guide and surrounding the die-head, guiding-supports in the casing for the chasers and means whereby pressure may be exerted on the casing-to rotate scribed. I a

2. In a screw-thread-cutting apparatus, the; combination with the tubular workuide having exterior screw-threads, means w ereby the guide may be detachably connected with the work and a die-head havin internal threads adapted to fit the threa s on the guide for effecting a lon itudinal movement of the diehead, of radia ly-movable ch'asers mountedinthe die-head, a casingrotatably connected with the guide and forming a housing for the die-head, means for preventing the relative rotation of casing and die head and guiding-supports in the casing for the outer ends of the chasers; substantially,

as described.

the combination with the casing and the diehead guided to slide longitudinally in one end of said casing and having internal screwthreads, of the: tubular Work-guide j ournaled in the o posite end of said casin and held against ongitudinal movement t erein and,

havin external screw-threads cooperating with t e screw-threads-of the die-head, radi-' ally-movable chasers mounted in the diehead and guiding-sup orts located within and supported throug out their lengthby the casing and having inclined faces against which the ends of the chasers rest; substantially as described.

. the combination with the die-head, radiallymovable chasers carried thereby, inclined guiding-supports for the chasersfor effecting 3. In a screw-thread-cutting apparatus,

4. In a screw-thread-cutting apparatus,v

a radial movement of the chasers as they advance longitudinally of the Work, a carrier for the uidingsupport's and means for moving the ie-head and carrier longitudinally with relation to each other, of an adjustable stop for limiting the longitudinal movementpf the die-head and chasers with respect to the inclined guiding-supports and carrier; sub-- stantially as-described.

5. In a' screw-thread-cutting apparatus, the combination with the die-head and workguide in screw-thread engagement with each other to effect relative longitudinal movement, of radially-movable chasers mounted in the die-head, inclined guiding-supports held in position by the work-guide and controlling the radial position of the ohasers, an

ing connected by a screW-thread connection,

of an adjustable stop on the casing for limiting the outward movement of the die-head, radially-movable Chasers in the die-head and supporting guides in the casing having inclined bearing-surfaces for cooperation with the chasers; substantially as described.

7. In a screw-thread-cuttin ap aratus the combination with the die-hea ,"ra ially-movable chasers mounted therein and casin carrying the die-head, of supporting-'g'ui es for the outer ends of thecha'sers' having inclined bearing-surfaces and removably mounted in the casing and means for efi'ecting a relative longitudinal movement'of the die-head and supporting-guides substantially as described.

1 FRANK PAVID CABLE.

Witnesses:- I

hGILBERT HARMON. I WM. M. HAMILTON. 

